Atmospheric variability in brown dwarfs with IRAC

Details Atmospheric variability in brown dwarfs with IRAC Atmospheric variability in brown dwarfs with IRAC

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3736g&link_type=abstract

Spitzer Proposal ID #3736

Physics

Scientific paper

We propose to use IRAC to study brown dwarfs for atmospheric variability. We will observe a sample of brown dwarfs from L2 to T2 to test atmospheric models of the L/T transition. Atmospheric variability, that is expected by some models for these objects, would constrain the physical parameters of cloud vertical distribution, horizontal homogeneity and the dynamics of the very cool atmospheres. The existence and amplitude of the variations would reveal the size and distribution of the cloud cover over the surface of the brown dwarf and test a model explaining the rapidity of the L to T type transition. The relative color changes would constrain the vertical extent of dynamical process and the depth in the atmosphere at which they take place. If a periodicity is measured, the rotational period of the dwarf could be estimated. SST provides the unique and crucial opportunity in a new wavelength range, to observe beyond Earth atmospheric variable absorption, with adequate time resolution, particularly in the important water bands.

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